EP0728528A1 - Cell for processing a liquid medium by flotation - Google Patents

Cell for processing a liquid medium by flotation Download PDF

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Publication number
EP0728528A1
EP0728528A1 EP19960400360 EP96400360A EP0728528A1 EP 0728528 A1 EP0728528 A1 EP 0728528A1 EP 19960400360 EP19960400360 EP 19960400360 EP 96400360 A EP96400360 A EP 96400360A EP 0728528 A1 EP0728528 A1 EP 0728528A1
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EP
European Patent Office
Prior art keywords
cell
air
injectors
cell according
liquid medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP19960400360
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German (de)
French (fr)
Inventor
Pierre Gonzalez
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Individual
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Individual
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • the present invention relates to a cell for the flotation treatment of a liquid medium.
  • the de-inking cells by flotation currently offered on the market are of the type in which the dough is propelled into the cell by a series of injectors and rotates at relatively high speed inside the cell. Free air is introduced through the injectors to create air bubbles inside the cell that will cause the ink particles to rise.
  • an air pressurization sends pressurized air mixed with water into the flotation cell.
  • Surface impurities are removed using a rotating bucket hinged to the center of the cell.
  • the object of the present invention is to remedy the drawbacks mentioned above presented by the known treatment cells and for this purpose it proposes a treatment cell acting by flotation which, by very significantly reducing the speed of circulation of the liquid medium to be treated. the interior of the cell makes it possible to substantially improve the quality of the treatment of this liquid medium.
  • the liquid medium treatment cell is of the type comprising at least one cylindrical chamber inside which the liquid medium to be treated is introduced by injectors and air intended to raise the on the surface the particles or waste contained in the liquid medium in order to evacuate them. It is characterized in that these so-called injectors have a tubular body with a substantially constant diameter and a series of exit orifices in the form of a honeycomb.
  • the injected air undergoes only a reduced thrust and is suitably dispersed to distribute itself homogeneously inside the liquid medium moving inside the cell.
  • the cell according to the invention is then provided with dimensions substantially larger than conventional cells, and the circulation speed inside the cell is greatly reduced, up to approximately five times, which makes it possible to achieve a much more effective treatment.
  • the air supply to the injectors is carried out by regulating valves which avoid turbulence inside the cell and therefore the loss of fibers in the case of de-inking paper.
  • the vertical conduit then serving for the evacuation of the air bubbles charged with ink terminates in a fiber recovery element.
  • FIG. 1 there is generally represented at 1 a deinking cell which comprises an upper cylindrical chamber 2 followed by a lower cylindrical chamber 3 of the same vertical axis.
  • the cell 1 comprises a vertical ink discharge pipe 4, which is open at its upper end and which continues, below the lower chamber 3, by an inclined part 5 extended by a fiber recovery element 6.
  • This deinking cell 1 is of dimensions much greater than those of conventional deinking cells and, by way of example, it will be indicated that its upper chamber 2 may have a diameter of about 5.50 m and a height of about 4 m, that its lower chamber 3 can have a diameter of about 3 m and a height of about 2 m, and that its central vertical pipe can have a diameter about 1 m.
  • the vertical pipe 4 is integral with one end of two curved walls 7,8, symmetrical with respect to the center of the tank, which extend radially and the other ends of which are integral with the inner face of the wall of the upper chamber 2. As will be seen later, these walls 7,8 serve to guide towards the inside of the pipe 4 the ink-laden foam located on the surface of the paper pulp circulating in the tank 1.
  • a lateral piping 9 goes around the upper cylindrical chamber 2 externally, at the lower part thereof, and is supplied with pulp diluted by a mouth 10, under the action of a distribution pump.
  • a pipe 12, equipped with three air intakes 13, is disposed above the upper chamber 2 and this pipe 12 communicates, by vertical tubes 14 and regulation valves 15, with the side pipe 9. The latter ensures by injectors 11, the projection inside the chamber 2 of a mixture of paper pulp and air.
  • each injector 11 ensuring the projection of paper pulp and air has the form of a tube 18 having a constant diameter over its entire length and it opens at its outlet end 19 by a dozen orifices 20 in the form of a honeycomb.
  • Such a structure of the injectors 11 ensures a lower and better distributed thrust compared to conventional injectors, by allowing a more satisfactory dispersion of the air in the paper pulp and therefore a better rise of the ink with a very low fiber loss.
  • a conduit 21 ensures the exit of the paper pulp after deinking.
  • the air, water and pulp rotate in cell 1 under the effect of the thrust provided by the injectors 11 and by the pulp distribution pump, at a speed of about five times lower compared to to conventional cells.
  • the ink particles in the pulp are lifted by air bubbles and, thanks to the addition of chemicals such as soaps or phosphates, form a foam on the surface which rotates in the same direction as the dough. This foam is stopped by the walls 7,8 forming barriers and is oriented towards the central pipe 4 forming a fall.
  • the evacuated foam falls on the inclined plane 5 where a spray of liquid (not shown diagrammatically in the drawing) makes it possible to separate the fibers, gathered in the recovery element 6, from the ink.
  • FIG. 5 and 6 there is shown a second embodiment of the invention applying to the treatment of stationery waste water.
  • the treatment cell 21, with upper 22 and lower 23 cylindrical chambers, is in all respects similar to that shown in FIGS. 1 and 2.
  • a vertical central duct 24 ensures the evacuation of waste rising to the surface of the treated water.
  • the cell 21 ′ comprises on the half of its horizontal surface a suction system 25, comprising for example a turbine not shown in the drawing, which comprises a mouth suction acting flush with the surface of the water, inside the cell, to suck the waste on the surface and evacuate it by an elbow conduit 26 and by the vertical central conduit 24.
  • a suction system 25 comprising for example a turbine not shown in the drawing, which comprises a mouth suction acting flush with the surface of the water, inside the cell, to suck the waste on the surface and evacuate it by an elbow conduit 26 and by the vertical central conduit 24.
  • the injection, inside the cell 21 ′, of residual water and air is ensured by injectors identical to that represented in FIG. 3, that is to say -to say having the shape of a tube of constant diameter over its entire length and opening at its outlet orifice by a dozen orifices in the shape of a honeycomb.
  • a lower peripheral piping 27 supplies such injectors (shown at 28 in FIG. 6) with residual water to be treated, while an upper piping 29 equipped with air intakes supplies, by vertical tubes 30 and regulating valves 31 , the injectors 28.
  • this structure of the injectors 28 provides a lower and better distributed thrust of the air in the residual water, by allowing a slower circulation of the water inside the cell and a greater air efficiency ensuring that waste rises to the surface of the water.
  • the suction system 25 which has a suction mouth positioned flush with the water, ensures the evacuation of this waste by the bent pipe 26 and the central pipe 24.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)

Abstract

The treatment cell consists of at least one cylindrical chamber with injectors for the liq. to be treated. Air carries particles or waste material contd. in the liq. to the surface for removal. Each of the injectors is in the form of a tubular body (18) of more or less constant dia., and a series of outlets (20) in a honeycomb configuration to ensure a good dispersal of the injected air in the liq. to be treated. The outlets (20) are ten in number, and the injectors are fed with air through regulating valves which prevent turbulence inside the chamber, which is some 5 m in dia. by 4 metres high. The particles raised to the surface by the air bubbles are removed through a vertical duct ending in a fibre recuperator.

Description

La présente invention concerne une cellule pour le traitement par flottation d'un milieu liquide.The present invention relates to a cell for the flotation treatment of a liquid medium.

Elle s'applique particulièrement, mais non exclusivement, au désencrage de la pâte à papier et au traitement des eaux résiduelles de papeterie.It applies particularly, but not exclusively, to deinking paper pulp and to the treatment of stationery waste water.

Les cellules de désencrage par flottation actuellement proposées sur le marché sont du type dans lequel la pâte est propulsée dans la cellule par une série d'injecteurs et tourne à vitesse relativement élevée à l'intérieur de la cellule. De l'air libre est introduit par les injecteurs pour créer à l'intérieur de la cellule des bulles d'air qui feront monter les particules d'encre.The de-inking cells by flotation currently offered on the market are of the type in which the dough is propelled into the cell by a series of injectors and rotates at relatively high speed inside the cell. Free air is introduced through the injectors to create air bubbles inside the cell that will cause the ink particles to rise.

Ces cellules de désencrage par flottation connues présentent l'inconvénient que le temps de séjour de la pâte à papier à l'intérieur de la cellule est trop court pour obtenir un bon désencrage. De plus l'agitation trop importante qui règne à l'intérieur de ces cellules provoque une floculation entraînant la perte de fibres.These known flotation deinking cells have the drawback that the residence time of the paper pulp inside the cell is too short to obtain good deinking. In addition, the excessive agitation which reigns inside these cells causes flocculation resulting in the loss of fibers.

Dans les systèmes connus de traitement d'eaux résiduelles par flottation, une pressurisation d'air envoie dans la cellule de flottation de l'air sous pression mélangé à de l'eau. Les impuretés en surface sont enlevées à l'aide d'un godet tournant articulé sur le centre de la cellule.In known systems for treating residual water by flotation, an air pressurization sends pressurized air mixed with water into the flotation cell. Surface impurities are removed using a rotating bucket hinged to the center of the cell.

Ces systèmes connus de traitement d'eaux résiduelles présentent l'inconvénient que la vitesse de circulation de l'eau à l'intérieur de la cellule est trop grande pour permettre d'obtenir un nettoyage réellement efficace de l'eau.These known water treatment systems The residual drawbacks are that the speed of circulation of the water inside the cell is too great to allow a truly effective cleaning of the water to be obtained.

La présente invention a pour objet de remédier aux inconvénients mentionnés ci-dessus présentés par les cellules de traitement connues et elle propose à cet effet une cellule de traitement agissant par flottation qui, en réduisant très sensiblement la vitesse de circulation du milieu liquide à traiter à l'intérieur de la cellule, permet d'améliorer substantiellement la qualité du traitement de ce milieu liquide.The object of the present invention is to remedy the drawbacks mentioned above presented by the known treatment cells and for this purpose it proposes a treatment cell acting by flotation which, by very significantly reducing the speed of circulation of the liquid medium to be treated. the interior of the cell makes it possible to substantially improve the quality of the treatment of this liquid medium.

Selon l'invention, la cellule de traitement d'un milieu liquide est du type comprenant au moins une chambre cylindrique à l'intérieur de laquelle on introduit par des injecteurs le milieu liquide à traiter et de l'air destiné à faire monter jusqu'à la surface les particules ou déchets contenus dans le milieu liquide afin de les évacuer. Elle se caractérise en ce que ces dits injecteurs présentent un corps tubulaire d'un diamètre sensiblement constant et une série d'orifices de sortie en forme de nid d'abeilles.According to the invention, the liquid medium treatment cell is of the type comprising at least one cylindrical chamber inside which the liquid medium to be treated is introduced by injectors and air intended to raise the on the surface the particles or waste contained in the liquid medium in order to evacuate them. It is characterized in that these so-called injectors have a tubular body with a substantially constant diameter and a series of exit orifices in the form of a honeycomb.

Par cette structure des injecteurs, l'air injecté ne subit qu'une poussée réduite et se trouve convenablement dispersé pour se répartir de façon homogène à l'intérieur du milieu liquide en déplacement à l'intérieur de la cellule.By this structure of the injectors, the injected air undergoes only a reduced thrust and is suitably dispersed to distribute itself homogeneously inside the liquid medium moving inside the cell.

La cellule selon l'invention est alors prévue avec des dimensions sensiblement plus grandes que les cellules conventionnelles, et la vitesse de circulation à l'intérieur de la cellule se trouve fortement réduite, jusqu'à environ cinq fois, ce qui permet de réaliser un traitement beaucoup plus efficace.The cell according to the invention is then provided with dimensions substantially larger than conventional cells, and the circulation speed inside the cell is greatly reduced, up to approximately five times, which makes it possible to achieve a much more effective treatment.

L'alimentation en air des injecteurs s'effectue à partir de valves de régulation qui évitent les turbulences à l'intérieur de la cellule et donc la perte de fibres dans le cas du désencrage de pâte à papier. De plus, le conduit vertical servant alors à l'évacuation des bulles d'air chargées d'encre se termine par un élément de récupération de fibres.The air supply to the injectors is carried out by regulating valves which avoid turbulence inside the cell and therefore the loss of fibers in the case of de-inking paper. In addition, the vertical conduit then serving for the evacuation of the air bubbles charged with ink terminates in a fiber recovery element.

Pour bien faire comprendre le dispositif selon l'invention, on en décrira ci-après, à titre d'exemples non limitatifs, deux formes d'exécution préférées en référence au dessin schématique annexé dans lequel :

  • la figure 1 est une vue en élévation d'une cellule de désencrage par flottation selon la présente invention :
  • la figure 2 est une vue en plan de la cellule de la figure 1 ;
  • la figure 3 est une vue en coupe verticale longitudinale d'un injecteur équipant la cellule de désencrage des figures 1 et 2 ;
  • la figure 4 est une vue en bout de l'injecteur de la figure 3 ;
  • la figure 5 est une vue en élévation d'une cellule de traitement d'eaux résiduelles de papeterie selon une seconde forme d'exécution de l'invention ; et
  • la figure 6 est, à plus grande échelle, une vue en plan de la cellule de la figure 5.
To clearly understand the device according to the invention, two preferred embodiments will be described below, by way of non-limiting examples, with reference to the appended schematic drawing in which:
  • FIG. 1 is an elevation view of a deinking inking cell according to the present invention:
  • Figure 2 is a plan view of the cell of Figure 1;
  • Figure 3 is a longitudinal vertical sectional view of an injector fitted to the deinking cell of Figures 1 and 2;
  • Figure 4 is an end view of the injector of Figure 3;
  • Figure 5 is an elevational view of a stationary water treatment cell according to a second embodiment of the invention; and
  • FIG. 6 is, on a larger scale, a plan view of the cell of FIG. 5.

Aux figures 1 à 4, selon une première forme d'exécution de la présente invention, on a représenté de façon générale en 1 une cellule de désencrage qui comprend une chambre cylindrique supérieure 2 se poursuivant par une chambre cylindrique inférieure 3 de même axe vertical. En son centre, sur toute sa hauteur, la cellule 1 comporte une conduite verticale 4 d'évacuation de l'encre, qui est ouverte à son extrémité supérieure et qui se poursuit, au-dessous de la chambre inférieure 3, par une partie inclinée 5 se prolongeant par un élément de récupération de fibres 6.In Figures 1 to 4, according to a first embodiment of the present invention, there is generally represented at 1 a deinking cell which comprises an upper cylindrical chamber 2 followed by a lower cylindrical chamber 3 of the same vertical axis. In its center, over its entire height, the cell 1 comprises a vertical ink discharge pipe 4, which is open at its upper end and which continues, below the lower chamber 3, by an inclined part 5 extended by a fiber recovery element 6.

Cette cellule de désencrage 1 est de dimensions bien supérieures à celles des cellules de désencrage conventionnelles et, à titre d'exemple, on indiquera que sa chambre supérieure 2 peut avoir un diamètre d'environ 5,50 m et une hauteur d'environ 4 m, que sa chambre inférieure 3 peut avoir un diamètre d'environ 3 m et une hauteur d'environ 2 m, et que sa conduite verticale centrale peut avoir un diamètre d'environ 1 m.This deinking cell 1 is of dimensions much greater than those of conventional deinking cells and, by way of example, it will be indicated that its upper chamber 2 may have a diameter of about 5.50 m and a height of about 4 m, that its lower chamber 3 can have a diameter of about 3 m and a height of about 2 m, and that its central vertical pipe can have a diameter about 1 m.

Vers son extrémité supérieure la conduite verticale 4 est solidaire d'une extrémité de deux parois incurvées 7,8, symétriques par rapport au centre de la cuve, qui s'étendent radialement et dont les autres extrémités sont solidaires de la face intérieure de la paroi de la chambre supérieure 2. Comme on le verra plus loin, ces parois 7,8 servent à guider vers l'intérieur de la conduite 4 la mousse chargée d'encre se trouvant à la surface de la pâte à papier en circulation dans la cuve 1.Towards its upper end, the vertical pipe 4 is integral with one end of two curved walls 7,8, symmetrical with respect to the center of the tank, which extend radially and the other ends of which are integral with the inner face of the wall of the upper chamber 2. As will be seen later, these walls 7,8 serve to guide towards the inside of the pipe 4 the ink-laden foam located on the surface of the paper pulp circulating in the tank 1.

Une tuyauterie latérale 9 fait extérieurement le tour de la chambre cylindrique supérieure 2, à la partie inférieure de celle-ci, et est alimentée en pâte à papier diluée par une bouche 10, sous l'action d'une pompe de distribution.A lateral piping 9 goes around the upper cylindrical chamber 2 externally, at the lower part thereof, and is supplied with pulp diluted by a mouth 10, under the action of a distribution pump.

Une tuyauterie 12, équipée de trois prise d'air 13, est disposée au-dessus de la chambre supérieure 2 et cette tuyauterie 12 communique, par des tubes verticaux 14 et des valves de régulation 15, avec la tuyauterie latérale 9. Celle-ci assure par des injecteurs 11, la projection à l'intérieur de la chambre 2 d'un mélange de pâte à papier et d'air.A pipe 12, equipped with three air intakes 13, is disposed above the upper chamber 2 and this pipe 12 communicates, by vertical tubes 14 and regulation valves 15, with the side pipe 9. The latter ensures by injectors 11, the projection inside the chamber 2 of a mixture of paper pulp and air.

Selon l'invention, chaque injecteur 11 assurant la projection de pâte à papier et d'air présente la forme d'un tube 18 ayant un diamètre constant sur toute sa longueur et il s'ouvre à son extrémité de sortie 19 par une dizaine d'orifices 20 en forme de nid d'abeilles.According to the invention, each injector 11 ensuring the projection of paper pulp and air has the form of a tube 18 having a constant diameter over its entire length and it opens at its outlet end 19 by a dozen orifices 20 in the form of a honeycomb.

Une telle structure des injecteurs 11 assure une poussée inférieure et mieux répartie par rapport aux injecteurs conventionels, en permettant une dispersion plus satisfaisante de l'air dans la pâte à papier et donc une meilleure montée de l'encre avec une très faible perte de fibres.Such a structure of the injectors 11 ensures a lower and better distributed thrust compared to conventional injectors, by allowing a more satisfactory dispersion of the air in the paper pulp and therefore a better rise of the ink with a very low fiber loss.

En partie basse de la chambre cylindrique inférieure 3, un conduit 21 assure la sortie de la pâte à papier après désencrage.In the lower part of the lower cylindrical chamber 3, a conduit 21 ensures the exit of the paper pulp after deinking.

Le fonctionnement du dispositif se comprend immédiatement d'après la description qui précède.The operation of the device is immediately understood from the above description.

De la pâte à papier devant être désencrée et diluée dans de l'eau, par exemple à 1% de concentration, arrive par la tuyauterie 9 et est introduite dans la cellule 1, en mélange avec de l'air, par les injecteurs 11. Une bonne dispersion de l'air dans la pâte à papier étant ainsi assurée.Paper pulp to be de-inked and diluted in water, for example at 1% concentration, arrives through the piping 9 and is introduced into the cell 1, in mixture with air, through the injectors 11. This ensures good air dispersion in the paper pulp.

L'air, l'eau et la pâte à papier tournent dans la cellule 1 sous l'effet de la poussée fournie par les injecteurs 11 et par la pompe de distribution de la pâte, à une vitesse d'environ cinq fois inférieure par rapport aux cellules conventionnelles.The air, water and pulp rotate in cell 1 under the effect of the thrust provided by the injectors 11 and by the pulp distribution pump, at a speed of about five times lower compared to to conventional cells.

Les particules d'encre contenues dans la pâte à papier sont soulevées par les bulles d'air et, grâce à l'addition de produits chimiques tels que des savons ou des phosphates, forment une mousse en surface qui tourne dans le même sens que la pâte. Cette mousse est arrêtée par les parois 7,8 formant barrières et se trouve orientée vers la conduite centrale 4 formant chute.The ink particles in the pulp are lifted by air bubbles and, thanks to the addition of chemicals such as soaps or phosphates, form a foam on the surface which rotates in the same direction as the dough. This foam is stopped by the walls 7,8 forming barriers and is oriented towards the central pipe 4 forming a fall.

En bas de la conduite centrale 4, la mousse évacuée tombe sur le plan incliné 5 où une pulvérisation de liquide (non schématisée au dessin) permet de séparer les fibres, rassemblées dans l'élément de récupération 6, de l'encre.At the bottom of the central pipe 4, the evacuated foam falls on the inclined plane 5 where a spray of liquid (not shown diagrammatically in the drawing) makes it possible to separate the fibers, gathered in the recovery element 6, from the ink.

En référence aux figures 5 et 6 on a représenté une seconde forme d'exécution de l'invention s'appliquant au traitement d'eaux résiduelles de papeterie.Referring to Figures 5 and 6 there is shown a second embodiment of the invention applying to the treatment of stationery waste water.

La cellule de traitement 21, à chambres cylindriques supérieure 22 et inférieure 23, est en tous points semblable à celle représentée aux figures 1 et 2. Un conduit central vertical 24 assure l'évacuation des déchets remontant en surface de l'eau traitée.The treatment cell 21, with upper 22 and lower 23 cylindrical chambers, is in all respects similar to that shown in FIGS. 1 and 2. A vertical central duct 24 ensures the evacuation of waste rising to the surface of the treated water.

La cellule 21', dont les dimensions sont du même ordre que celles représentées aux figures 1 et 2, comporte sur la moitié de sa surface horizontale un système d'aspiration 25, comportant par exemple une turbine non représentée au dessin, qui comprend une bouche d'aspiration agissant au ras de la surface de l'eau, à l'intérieur de la cellule, pour aspirer les déchets se trouvant à la surface et les évacuer par un conduit coudé 26 et par le conduit central vertical 24.The cell 21 ′, the dimensions of which are of the same order as those shown in FIGS. 1 and 2, comprises on the half of its horizontal surface a suction system 25, comprising for example a turbine not shown in the drawing, which comprises a mouth suction acting flush with the surface of the water, inside the cell, to suck the waste on the surface and evacuate it by an elbow conduit 26 and by the vertical central conduit 24.

Comme dans la cellule des figures 1 et 2, l'injection, à l'intérieur de la cellule 21', d'eau résiduelle et d'air est assurée par des injecteurs identiques à celui représenté à la figure 3 c'est-à-dire présentant la forme d'un tube de diamètre constant sur toute sa longueur et s'ouvrant à son orifice de sortie par une dizaine d'orifices en forme de nid d'abeilles. Une tuyauterie périphérique inférieure 27 alimente de tels injecteurs (figurés en 28 à la figure 6) en eau résiduelle à traiter, alors qu'une tuyauterie supérieure 29 équipée de prises d'air alimente, par des tubes verticaux 30 et des valves de régulation 31, les injecteurs 28.As in the cell of FIGS. 1 and 2, the injection, inside the cell 21 ′, of residual water and air is ensured by injectors identical to that represented in FIG. 3, that is to say -to say having the shape of a tube of constant diameter over its entire length and opening at its outlet orifice by a dozen orifices in the shape of a honeycomb. A lower peripheral piping 27 supplies such injectors (shown at 28 in FIG. 6) with residual water to be treated, while an upper piping 29 equipped with air intakes supplies, by vertical tubes 30 and regulating valves 31 , the injectors 28.

Comme on l'a vu plus haut, cette structure des injecteurs 28 assure une poussée inférieure et mieux répartie de l'air dans l'eau résiduelle, en permettant une circulation plus lente de l'eau à l'intérieur de la cellule et une plus grande efficacité de l'air assurant la montée des déchets à la surface de l'eau.As seen above, this structure of the injectors 28 provides a lower and better distributed thrust of the air in the residual water, by allowing a slower circulation of the water inside the cell and a greater air efficiency ensuring that waste rises to the surface of the water.

Le système d'aspiration 25, qui présente une bouche d'aspiration positionnée au ras de l'eau, assure l'évacuation de ces déchets par le conduit coudé 26 et le conduit central 24.The suction system 25, which has a suction mouth positioned flush with the water, ensures the evacuation of this waste by the bent pipe 26 and the central pipe 24.

On comprendra que la description ci-dessus a été donnée à simple titre d'exemple, sans caractère limitatif, et que des adjonctions ou des modifications constructives pourraient lui être apportées sans sortir du cadre de l'invention.It will be understood that the above description has been given by way of example, without limitation, and that additions or constructive modifications could be made to it without departing from the scope of the invention.

Claims (7)

Cellule pour le traitement de milieux liquides par flottation, comprenant au moins une chambre cylindrique (2,3) dans laquelle on introduit par des injecteurs (11,28) le milieu liquide à traiter et de l'air destiné à soulever jusqu'à la surface les particules ou déchets contenus dans le milieu liquide afin de les évacuer, caractérisée en ce que les dits injecteurs (11,28) présentent un corps tubulaire (18) de diamètre sensiblement constant et une série d'orifices de sortie (20) en forme de nid d'abeilles, de façon à assurer une bonne dispersion de l'air injecté qui se répartit de façon homogène à l'intérieur du milieu liquide en déplacement dans la cellule (1,21).Cell for the treatment of liquid media by flotation, comprising at least one cylindrical chamber (2,3) into which are injected by injectors (11,28) the liquid medium to be treated and air intended to lift up to the surface the particles or waste contained in the liquid medium in order to evacuate them, characterized in that the said injectors (11,28) have a tubular body (18) of substantially constant diameter and a series of outlet orifices (20) in honeycomb shape, so as to ensure good dispersion of the injected air which is distributed homogeneously inside the liquid medium moving in the cell (1,21). Cellule selon la revendication 1, caractérisée en ce que les dits orifices de sortie (20) sont au nombre d'une dizaine.Cell according to claim 1, characterized in that the said outlet orifices (20) are ten in number. Cellule selon la revendication 1 ou 2, caractérisée en ce que les dits injecteurs (11,28) sont alimentés en air à partir de valves de régulation (15,31) qui évitent les turbulences à l'intérieur de la chambre (2,3 - 22,23).Cell according to claim 1 or 2, characterized in that the said injectors (11,28) are supplied with air from regulation valves (15,31) which avoid turbulence inside the chamber (2,3 - 22.23). Cellule selon l'une quelconque des revendications précédentes, caractérisée en ce que sa chambre cylindrique (2) présente un diamètre de l'ordre de 5 mètres et une hauteur de l'ordre de 4 mètres.Cell according to any one of the preceding claims, characterized in that its cylindrical chamber (2) has a diameter of the order of 5 meters and a height of the order of 4 meters. Cellule selon l'une quelconque des revendications 1 à 4 pour le désencrage de pâte à papier, caractérisée en ce que les particules d'encre entraînées en surface par des bulles d'air sont évacuées par un conduit vertical (4) formant chute qui se termine par un élément de récupération de fibres (6).Cell according to any one of claims 1 to 4 for deinking paper pulp, characterized in that the ink particles entrained on the surface by air bubbles are evacuated by a vertical conduit (4) forming a drop which is ends with a fiber recovery element (6). Cellule selon l'une quelconque des revendications 1 à 4 pour le traitement d'eaux résiduelles de papeterie, caractérisée en ce que les déchets entraînés en surface par les bulles d'air sont évacués par aspiration, en passant par un conduit central vertical.Cell according to any one of claims 1 to 4 for the treatment of residual water from the stationery industry, characterized in that the waste entrained on the surface by the air bubbles is evacuated by suction, passing through a vertical central duct. Cellule selon la revendication 6, caractérisée en ce que les déchets se trouvant en surface de l'eau résiduelle sont aspirés par une bouche d'aspiration positionnée au ras de l'eau.Cell according to claim 6, characterized in that the waste on the surface of the residual water is sucked in by a suction mouth positioned flush with the water.
EP19960400360 1995-02-23 1996-02-22 Cell for processing a liquid medium by flotation Withdrawn EP0728528A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9502089 1995-02-23
FR9502089A FR2730941B1 (en) 1995-02-23 1995-02-23 CELL FOR THE FLOTATION TREATMENT OF A LIQUID MEDIUM

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582681A (en) 1994-06-29 1996-12-10 Kimberly-Clark Corporation Production of soft paper products from old newspaper
US6001218A (en) 1994-06-29 1999-12-14 Kimberly-Clark Worldwide, Inc. Production of soft paper products from old newspaper
US6074527A (en) 1994-06-29 2000-06-13 Kimberly-Clark Worldwide, Inc. Production of soft paper products from coarse cellulosic fibers
US6296736B1 (en) 1997-10-30 2001-10-02 Kimberly-Clark Worldwide, Inc. Process for modifying pulp from recycled newspapers
US6387210B1 (en) 1998-09-30 2002-05-14 Kimberly-Clark Worldwide, Inc. Method of making sanitary paper product from coarse fibers
GB9921716D0 (en) * 1999-09-14 1999-11-17 Maelgwyn Mineral Services Limi Pneumatic flotation separation device
US7108136B2 (en) * 2001-03-19 2006-09-19 Rainer Imhof Pneumatic flotation separation device
RU2281169C1 (en) * 2004-12-06 2006-08-10 Закрытое акционерное общество "Научно-производственный внедренческий центр "Уральский научно-исследовательский и проектный институт обогащения и механической обработки полезных ископаемых - Техника" (ЗАО НПВЦ "Уралмеханобр - Техника") Column type flotation pneumatic machine
TWI429745B (en) * 2007-06-19 2014-03-11 Renewable Algal Energy Llc Process for microalgae conditioning and concentration
US11028727B2 (en) * 2017-10-06 2021-06-08 General Electric Company Foaming nozzle of a cleaning system for turbine engines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH581493A5 (en) * 1974-06-24 1976-11-15 Escher Wyss Ag Static mixer for in line mixing - having sudden expansion with secondary fluid injection just prior to it
EP0037513A1 (en) * 1980-04-09 1981-10-14 Feldmühle Aktiengesellschaft Flotation apparatus for deinking fibrous suspensions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE348119B (en) * 1969-05-03 1972-08-28 Altenbergs Bergbau
US4014961A (en) * 1973-04-24 1977-03-29 Vitaly Fedorovich Popov Ejector mixer for gases and/or liquids
US4331534A (en) * 1978-08-21 1982-05-25 Feldmuhle Aktiengesellschaft Method of and arrangement for the de-inking of pulp suspensions
AT387407B (en) * 1984-01-09 1989-01-25 Escher Wyss Gmbh FLOTATION DEVICE FOR FLOTING FIBER FIBER SUSPENSION MADE FROM WASTE PAPER

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH581493A5 (en) * 1974-06-24 1976-11-15 Escher Wyss Ag Static mixer for in line mixing - having sudden expansion with secondary fluid injection just prior to it
EP0037513A1 (en) * 1980-04-09 1981-10-14 Feldmühle Aktiengesellschaft Flotation apparatus for deinking fibrous suspensions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BAHR ET AL:: "5 Jahre Betriebserfahrung mit der pneumatischen Flotation in der Steinkohlenaufbereitung", AUFBEREITUNGS TECHNIK, vol. 28, no. 1, January 1987 (1987-01-01), WIESBADEN DE, pages 1 - 9, XP002004217 *

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US5651879A (en) 1997-07-29
FR2730941B1 (en) 1997-05-16

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